*{
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
a{
    text-decoration: none;
}
body,html{
    width: 100%;
    height: 100%;
    font-size: 100px;;
}

.mark{
    width: 100%;
    height: 0.6rem;
    position: fixed;
    background: white;
    z-index: 2;
    opacity: 0;
    /* display: none; */
    background-image: url(../img/tm.png);
    top: 0px;
    transition: all 0.5s 0s linear;
}
.mark.active{
    opacity: 0.97;
}
header{
    display: flex;
    justify-content: space-between;
    padding: 0.15rem 0.15rem;
    position: fixed;
    z-index: 4;
    width: 100%;
    box-sizing: border-box;
    top: 0;
    align-items: center;
    left: 0;
}
header a{
    display: inline-block;
    width: 0.8rem;
    background-image: url(../img/logo_2.png);
    background-size: contain;
    height: 0.3rem;
    background-repeat: no-repeat;
}
header a.open{
    background-image: url(../img/logo_2.png) !important;
    
}
header a img{
    width: 100%;
    height: 100%;
}
.line1,.line2,.line3{
    width: 0.25rem;
    display: block;
    height: 3px;
    background: white;
    margin: 0.03rem;
    transition: all 0.3s 0.2s linear;
}
footer{
    background-color: #1B1B1B;
    display: flex;
    padding: 0.03rem 0.15rem;
    /* justify-content: center; */
    align-items: center;
    /* padding: 0.03rem 0rem; */
    z-index: 2;
    box-sizing: border-box;
}
footer img{
    background-color: #1B1B1B;
    /* padding: 0.1rem 0.15rem; */
    width: 0.25rem;
    height: 100%;
    
}
footer a{
    
    color: gray;
}
footer p{
    font-size: 0.12rem;
    color: #707070;
    line-height: rem;
    margin-left: 0.2rem;
    /* padding: 0.03rem; */
    font-family: Helvetica;
}
.line1.open{
    background-color: white !important;
    transform:translateY(7px) rotate(45deg);
   
}
.line3.open{
    background-color: white !important;
    transform:translateY(-5px) rotate(-45deg);
   
}
.line2.open{
    background-color: white !important;
    opacity: 0;
}
.s_nav{
    position: fixed;
    width: 100%;
    background-color: #2E2E2E;
    height: 100%;
    z-index:3;
    top: 0;
    left: 0;
    opacity: 0;
    transform: translateX(-100%);
    transition: all 0.5s 0s ease-out;
}
.s_nav.open{
    transform: translateX(0);
    opacity: 1;
    /* padding-top: 1rem; */
    box-sizing: border-box;
    padding: 1rem 0.2rem;
    box-sizing: border-box;
}
.s_nav li:hover{
    /* padding-left: 30px; */
}
.s_nav li{
    list-style-type: none;
    
    /* border-bottom: 0.01rem solid gray; */
    border-bottom: 0.01rem solid rgb(63, 59, 59) ;

   opacity: 0;
    transform: translateY(0.3rem);
    /* transition: all 0.3s 0s linear ; */
}
.s_nav li.active{
    transition: " all 0s 0s linear";
}
.s_nav li.hover{
    /* transition: all 0.3s 0s linear !important */
}
.s_nav a{
    font-size: 16px;
    color: white;
    opacity: 1;
    width: 100%;
    height: 100%;
    display: block;
    padding: 0.15rem 0.15rem;
   
}
.sub_txt.active{
    height: 0;
}
.s_nav a.open{
    opacity: 1;
    
}
.s_nav li.open{
    opacity: 1;
    transform: translateY(0);
}
.s_nav li:nth-child(1)
{
    transition: all 0.2s 0.5s ease-out;
}
.s_nav li:nth-child(2)
{
    transition: all 0.3s 0.55s ease-out;
}
.s_nav li:nth-child(3)
{
    transition: all 0.4s 0.6s ease-out;
}
.s_nav li:nth-child(4)
{
    transition: all 0.5s 0.65s ease-out;
}
.s_nav li:nth-child(5)
{
    transition: all 0.6s 0.7s ease-out;
}

.s_nav.active{
    transform: translateY(0);
    opacity: 0;
}
.sub_nav a i{
    content: "\e6aa";
    font-family: "iconfont";
    margin-left: 0.1rem;
    font-size: 0.14rem;
    position: absolute;
    top: 0.2rem;
    transform: rotate(180deg);
    transition: all 0.3s 0s linear;
   
}
.sub_nav a i.active{
    transform: rotate(0deg);
     top:0.2rem;
     
}

.sub_txt a{
    margin-left: 0.3rem;
    font-size: 15px;
    color: gray;
  
  
}
body.open{
    overflow: hidden;
}
#m{
    width:0.7rem;height:0.7rem;top:-0.7rem;
    position: absolute;
    width: top;
   left: 0.14rem;
    opacity: 0;
    transition: all 0.5s 0s linear;
    /* display: none; */

}
#m.active{
    opacity: 1;
    /* display: block; */
}
@media screen and (min-width: 768px){
    #m{
        top: -110px;
        width: 100px;
        height: 100px;
    }
    .sub_txt a:hover{
        color: white !important;
    }
    .line3.open{
        background-color: white !important;
        transform:translateY(-7px) rotate(-45deg);
       
    }
    header a{
        width: 100px;
        /* height: 34px; */
    }
    header{
        padding: 18px 10%;
    }
    footer {
        background-color: #1B1B1B;
        display: flex;
        padding: 10px 20px;
        /* justify-content: center; */
        align-items: center;
        position: fixed;
        bottom: 0;
        z-index: 2;
        width: 100%;
        /* overflow: hidden; */
    }
    footer img {
        background-color: #1B1B1B;
        /* padding: 0.1rem 0.15rem; */
        width: 24px;
        height: 100%;
        cursor: pointer;
    }
    footer p{
        font-size: 13px;
        margin-left: 20px;
        line-height: 0;
    }
    .s_nav.open{
        padding: 10%;
        box-sizing: border-box;
    }
    .mark{
        height: 75px;
        border-bottom: 1px solid gainsboro;
    }
    .s_nav a{
        font-size: 18px;
        transition: all 0.2s 0s linear;
       
    }
   .s_nav a:hover{
        color: gray;
       transform: translateX(10px);
    }
  
}